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  1. PO
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    <p>I already found the answer... :)</p> <p>I create method to calculate array value from audio...</p> <pre><code>public double[] calculateFFT(byte[] signal) { final int mNumberOfFFTPoints =1024; double mMaxFFTSample; double temp; Complex[] y; Complex[] complexSignal = new Complex[mNumberOfFFTPoints]; double[] absSignal = new double[mNumberOfFFTPoints/2]; for(int i = 0; i &lt; mNumberOfFFTPoints; i++){ temp = (double)((signal[2*i] &amp; 0xFF) | (signal[2*i+1] &lt;&lt; 8)) / 32768.0F; complexSignal[i] = new Complex(temp,0.0); } y = FFT.fft(complexSignal); // --&gt; Here I use FFT class mMaxFFTSample = 0.0; mPeakPos = 0; for(int i = 0; i &lt; (mNumberOfFFTPoints/2); i++) { absSignal[i] = Math.sqrt(Math.pow(y[i].re(), 2) + Math.pow(y[i].im(), 2)); if(absSignal[i] &gt; mMaxFFTSample) { mMaxFFTSample = absSignal[i]; mPeakPos = i; } } return absSignal; } </code></pre> <p>Then I called it in class Write Audio..</p> <pre><code>private void writeAudioDataToFile(){ byte data[] = new byte[bufferSize]; String filename = getTempFilename(); FileOutputStream os = null; try { os = new FileOutputStream(filename); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } int read = 0; if(null != os){ while(isRecording){ read = recorder.read(data, 0, bufferSize); if(read &gt; 0){ absNormalizedSignal = calculateFFT(data); // --&gt; HERE ^__^ } if(AudioRecord.ERROR_INVALID_OPERATION != read){ try { os.write(data); } catch (IOException e) { e.printStackTrace(); } } } try { os.close(); } catch (IOException e) { e.printStackTrace(); } } } </code></pre>
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